Gabriel Muench [http://community.jboss.org/people/Fuchs] created the discussion
"Lazy loading problem: ERROR [LazyInitializationException]" To view the discussion, visit: http://community.jboss.org/message/533329#533329 -------------------------------------------------------------- Hello, i have a problem with LazyInitialization. Here is the error message: 15:25:14,950 ERROR [LazyInitializationException] failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358) ... 15:25:14,955 ERROR [LazyInitializationException] failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358) ... 15:25:14,958 ERROR [STDERR] org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358) ... 15:25:14,959 ERROR [STDERR] rtal.portlet.aspects.portlet.PortletSessionSynchronizationInterceptor.invoke(PortletSessionSynchronizationInterceptor.java:82) at org.jboss.portal.portlet.PortletInvokerInterceptor.invoke(PortletInvokerInterceptor.java:82) ... 15:25:14,960 ERROR [STDERR] ptor.invoke(ControllerInterceptor.java:40) at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115) ... 15:25:14,960 ERROR [STDERR] ts.tx.TxInterceptor$RequiresNew.invoke(TxInterceptor.java:253) at org.jboss.portal.core.aspects.server.TransactionInterceptor$invoke_N5143606530999904530.invokeNext(TransactionInterceptor$invoke_N5143606530999904530.java) ... About the environment: I use Hibernate as persistence provider and EJB 3 Annotations + Java 5 to map a MySQL database. The mapping is intergrated into the JBoss Portal 2.7.2 server. My JSF 1.1.14 + Facelets and Richfaces 3.3.1 portlet with PortletBridge 1.0.0 use the persistence mapping in this way: ICustomerHome customers = (ICustomerHome) context.lookup("CustomerHome/local"); customer = customers.findByJbossUser(username); powIds = new ArrayList<Integer>(); powMeterList = customer.getPowMeters(); This is what i have done to avoid the problem with lazy loading, till now: Customer instance = entityManager.find(Customer.class, id); instance.getPowMeters().size(); But i think this solution is not the right way. There must be a fault in "Transaction", because the same should be done with EAGER loading. If i use EAGER FetchType instead of LAZY the problem will not be solved. @OneToMany(fetch = FetchType.EAGER, mappedBy = "customer") public Set<PowMeter> getPowMeters() { return this.powMeters; } Can anyone help me, please? Cheers! -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/533329#533329] Start a new discussion in EJB 3.0 at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2029]
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